Solder paste shelf life

Have some leaded, water soluble solder paste (Kester HM531) for the last 3.5 years. Used it yesterday and it seems to still work like new. IIRC, shelf life was given as the usual six months. What gives?

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The difference between "It probably still works" and it will "definitely work."


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Jeffrey D Angus

The stuff I use is water soluble Alphametals/Tolworth/England. Dated 1990 on the pot , I just pastify a bit by mixing with "La-Co"/ Chicago flux and seems to work fine.

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